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authorRichard Cochran <richardcochran@gmail.com>2019-11-14 21:45:02 +0300
committerDavid S. Miller <davem@davemloft.net>2019-11-15 23:48:32 +0300
commit6138e687c7b679da08c0feb55a88f448f7890c07 (patch)
tree5fa29b3639962a57b0b0e7e81690311ff2b06710 /drivers/ptp/ptp_chardev.c
parent592025a03b34927f35852058c933ffcd7c500321 (diff)
downloadlinux-6138e687c7b679da08c0feb55a88f448f7890c07.tar.xz
ptp: Introduce strict checking of external time stamp options.
User space may request time stamps on rising edges, falling edges, or both. However, the particular mode may or may not be supported in the hardware or in the driver. This patch adds a "strict" flag that tells drivers to ensure that the requested mode will be honored. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ptp/ptp_chardev.c')
-rw-r--r--drivers/ptp/ptp_chardev.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index cbbe1237ff8d..9d72ab593f13 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -150,6 +150,8 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
break;
}
if (cmd == PTP_EXTTS_REQUEST2) {
+ /* Tell the drivers to check the flags carefully. */
+ req.extts.flags |= PTP_STRICT_FLAGS;
/* Make sure no reserved bit is set. */
if ((req.extts.flags & ~PTP_EXTTS_VALID_FLAGS) ||
req.extts.rsv[0] || req.extts.rsv[1]) {